Wrench



E. P. SCHWARZ.

WRENCH.

APPLICATION FlLED-DEC.30, 19l9.

. 1,399,890. l Patented- .Dec. 1 3, 1921.

'mil Salwar@ Unirse ASTATES.Parent orries'.fj i

EMIL 1. scnwnnz, or s'r.l PAUL, nr'nnnso'rn.

`iarmaron'.

To all, whom t 'may concern Be 1t knownV that' 1, EMIL P. Sonwanz, residing at St. Paul',- in the county of Ramsey Vand State of lvlinnesota, havefirr-l vented a new and useful Improvement in l/Vrenches, of which the' following is a spesi-l with a threaded handle bar',l amov'able jaw f member is adjustably mounted and arranged to cooperate withY the stationary jaw mem?- ber for use in turni-ng or holding differentVV sizes ofpipes, nuts and bolt heads, and a yoke frame carrying the movable jaw mem-3 ber is adjust-'ably arranged to slide back and forth on the handle of the stationary jaw member and to be moved into and out of screw adjusting connection therewith.' More particularly this invention relates to a'modi-r fication of the construction disclosedin my comp aniony application filed August`29', '1919, bearing Ser. No. 320,650. In the present ap; plication the movable jaw member is pivotally mounted upon the yoke member and is guided and supported laterally in an improved manner, the yoke member being so constructed as to pivotally support the movable jaw member in a strong and efficient manner, thus producing a wrench which is particularly adapted for holding or turning pipes and whereby the jaws can be easily and quickly adjusted to any size of work.

In the accompanying drawings forming part of this specification, Figure 1 is a side elevation of my invention; Fig. 2 is a. view similar to that illustrated in Fig. 1, except that a portion thereof is shown in central longitudinal section, and Fig. 3 is a cross sectional view taken von the line 3 3 of Fig. 1.

1n the drawing A indicates the stationary jaw member having the integral rack handle bar B threaded at 10 on one-edge andv formed with a serrated work gripping surface 11. D indicates the movable jaw member which has a serrated work gripping surface 12 adapted to cooperate with the gripping surface 11. This movable jaw member has a rock bar or shank 13 extending over the stationary jaw member and resting upon the surface or bearing 14 of the stationary member which acts as a fulcrurn above the threaded edge of the shank B. This'fulcrum member has apair vof lips or .SpeeifcationofLetters atent. Patentede. 19,31. v Applicationled'Decemberm 1919. S'eral''. 3228,42'81' i i i flanges 15 betwefenwhi'c'h thel'shank 13 is helldflaterally andn by which aside support y is formed for bracing 'the movable'jaw niem`- f ber.l The rearward end of ythe shank 13 is secu-red in a yoke member E by Ameans, 'of 'the pivot'l. f i

The 'yo-ke member n n `rentar with a, f

nagaat-inai-passage 17 armagh which the handle-bar Bl passes. -It lis also formed with a forwardly .projectii'ig body 18 in; which is alongitudinal a'ferture 19 which receives the outer lend o the sh'ankvl and 'aoross .which the' pi-ifot f'is'fsecured. yThe yoke membery is'free to slide on'jthe shank B,'its

body' portion being ofsuliicient lei'i'gth to form a strong and substantial' connection onv shank B. The main bodyf'portion of the yoke member has: a transverse opening 20- above theteeth 10' onthehandle bar in which opening isi rotatably rnount'edthe adthe sides-of? the yokemember" for turning by i hand. l Thus vthere is formeda ba'rfw21 which reinforces'fthe structural strength of the yoke" memben: thefstructure resembling yokespanningthe screw closed ati-"op'pb'site'- side portions of the'screwand reducingfallv tendency to -bind the screw. The screw has a shaft 22 fixed on its axis the ends of which resemble trunnions which 'l revolve freely in verticle guide passages 23 Yand 24 inthebody of the yoke member, `the open ing 24 extending rearwardlyv sothat the shaft can be inserted in the screw after the latter. has been placedv in the opening20-n Positioned above the trunnions on the screw are a pair of receptacles 2 5 'and 2G `whirl] holda pair of helical springs 27 Vand 28 pressing down upon the trunnions. These springs releasably hold the screw ywith its outer ends ofthe receptacles. The outermost edge of the rearward end ofthe shank 13 vis l formed with an outermost clearance depres- 1 sion 30 which permits a limited tilt1ng'-movement of the movable jaw member'thus caus-` -Y ing the jaws to bite firmly when the wrench` is turned against the work.

The yoke shapedl structure'xconstituting Vso i Ci! projecting lside guiding members betweenv which the shank of the movable jaw member is supported constitute a unique strong and eEective structure adapted particularly for use in turning` or holding pipes or other objects.

In accordance with the patent statutes I have described the principles of operation of myk invention together with the apparatus which I now consider to represent the best embodiment thereof, but I desire to have it understood that the construction shown is only illustrative and that the invention can be carried out by other means and applied to uses other than those above set forth within the scope of the following claim.`

Having described my invention, what I claim as new and desire to protect by Let ters Patent, is

A wrench, comprising, in combination, a stationary jaw member having a handle bar, thread yengaging teeth on one edge of the handle bar,'a jaw extending from Lone end of the handle bar, side guides projecting from the` jaw ortion and a bearing between said side gui es, a yoke sliding longitudi-V nally on said handle bar having an aperture in one end and a transverse passage across said engaging teeth, said passage being closed at its outer end by an integral connecting portion and formed with a handle bar receiving longitudinal guide way at the inner end of said transverse passage, said yoke member being also formed with outwardly extending longitudinal gudgeon guide passages, and with outwardly extending spring holding receptacles open at their outer ends to receive springs and connecting with said guide passages, a screw in said transverse passage having gudgeons in and movable outwardly in said guide passages, a spring in each of saidy receptacles bearing downwardly against said gudgeons and releasably urging said screw with its teeth into engagement with the teeth of said handle bar, a movable jaw member having a rock bar pivotally secured at lone extremity. in said aperture, and a jaw on itsvfree' end adapted to coperate with said stationary jaw, said rock bar being fulcrumed freely ,i on the bearing between said side guides, the

inner surface of said aperture and theback of said rock bar being formed with a clearance space adapted to permit only'limited free outward tilting movement of the rock bar in the yoke and'consequent limited opening movement of the movable jaw, and closures in the outer ends of said spring holdving receptacles. f Y

In testimony whereof, I have signed my name to this specification.

EMIL P; SCHWARZ. 

